1) Thanks for reading.
2) Part of what I'm doing on that page is actually running through the math for math teachers, so I'm actually doing the calculations longhand instead of simply relying on the 4th down calculator. However of course, I take in the calculations from the WP calculator they have.
3) I think that's fair to consider the ANFLS calculator to be flawed because of sample size and/or strategy type issues. I actually disagree with their 4th and 7 rate of 42%, instead cherrypicking a 35% number I found somewhere else which I think is more reasonable. In the ANFLS calculator, it seems the most likely outcome would still be to kick the field goal, because that's what most coaches do with the ball at 1/10 on the 28 (ultimately). Sure, we can assign a better WP to this situation, and what I should personally do is recalculate the numbers to see how the WP really shakes out.
Finally, there's something I didn't consider. A friend says the Seahawks never intended to take a normal shot to the end zone. They intended to draw the 49ers off sides (which they did) and then take the free-play shot to the end zone, or take the 5 yards and attempt a 4th and 2, or take a delay of game and punt. The completed TD pass on the free play was a bonus.
Quote:
Originally Posted by ChrisV
First of all, you can just use the ANFLS fourth down calculator for this. The number it comes up with are broadly similar to yours but a little different (and it has going for it best). I assume this is because it's not making the assumption that the next set of downs are starting from the SF 28.
Secondly, the ANFLS calculator is horribly unreliable and its numbers are not to be trusted. Let's do a little sanity checking.
Numbers as per your post:
WP(Make FG) = 0.42
WP(Go for it, make 1st down at 28 yd line) = 0.45
WP(Score TD immediately) = 0.62
The WP of going for it and getting a first down is barely better than scoring a FG immediately. This implies an unreasonably high chance of turning the ball over without getting a FG, or an unreasonably low chance of scoring a TD, or both. Even if we adjust from the 28 to the 15 yard line, it only ups the WP to 0.48, which seems like madness considering a FG is a near certainty from there (barring a turnover or personal foul or something) and a TD is fairly likely.